Iam means, generally, “at some point previous” or “since some point previous”. In English, already, the most common translation, is used only to emphasize that this point might have been expected to be later, whereas now is used to emphasize that the statement was once false, even when the statement refers to a point in the past or future. Iam is used to express either. (Likewise, the most common Latin word for now, nunc, denotes only the literal present moment.) Also, where iam means now, it is often used in negative sentences, in which the most common English construction uses anymore.